JP2011220156A - Control device of cooling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve fuel efficiency by optimizing an operation state of an internal combustion engine, enhance warm-up performance by switching control of a cooling system, and provide an efficient cooling system irrespective of the operation state of the internal combustion engine.SOLUTION: The control device of the cooling system includes: a first channel which cools the power source of a vehicle; one or more second channels to be connected to the first channel to form a closed circuit and including a heat capacity unit; a switching valve for switching connection between the first and second channels; a cooling water pump; and a water temperature detection means. The control device controls a switching valve based on a state of the internal combustion engine, such as water temperature. A heat amount accumulation means is provided which starts accumulating the heat amount since the determination that the engine reaches a complete warm-up temperature or after the engine start, to set a predetermined heat amount for the second channel in advance. When the accumulated heat amount exceeds the predetermined heat amount for the second channel, the corresponding switching valve is controlled to be opened.

Description

The present invention relates to a control device for a cooling system, and relates to a cooling system for an internal combustion engine (also referred to as an “engine”) and its control technology.
In particular, the present invention relates to a control technique for a cooling system of an internal combustion engine including a heater circuit for air conditioning in a vehicle interior and a cooling circuit for auxiliary equipment for an internal combustion engine, and relates to a control technique for promoting warm-up.

Some conventional cooling systems control the cooling system in consideration of the heat generation amount of the internal combustion engine and the heat dissipation amount of the radiator.
Although control is performed by accurately detecting the temperature, the temperature change is a slow change that takes a relatively long time. Therefore, the detection update cycle is set to a longer cycle than combustion control. ing. As a result, the control cycle in which the temperature change is reflected tends to be slow.
On the other hand, as exhaust gas regulations and fuel efficiency performance requirements become more and more severe, there is a need for a cooling system control technique that can control the operating state of an internal combustion engine that directly affects them to a desired state.

Japanese Patent No. 3466177 Japanese Patent No. 3763458 Japanese Patent No. 4146372 JP 2007-1000063 A

By the way, in the conventional internal combustion engine, the cooling water passage is provided with a temperature control valve to change the flow path of the cooling water.
On the other hand, warm-up promotion control such as retarding the ignition timing and increasing the rotation is performed in order to promote warm-up of the internal combustion engine main body during cold operation.
However, when these warm-up promotion controls are executed, the amount of heat input is greater than after warm-up, and if the time is prolonged, fuel consumption improvement will be hindered. There is a problem.

In addition, in most of the conventional technologies described above, how much heat capacity each individual cooling path (also referred to as “circuit”) that constitutes the cooling system has, in other words, reduces the low temperature of each individual cooling circuit. It has not been performed until the amount of heat necessary for raising the temperature to a desired high temperature is sufficiently reflected.
For this reason, after switching the circuit by controlling the valve provided in the cooling system, the temperature of the cooling water is expected to change even if the temperature of the cooling water changes due to mixing of cooling water with different temperatures. It is not done until management.
For example, Japanese Patent Application Laid-Open No. 2007-1000063 includes one that adjusts the valve opening so as to finely control the inlet temperature of the engine. Although the combustion chamber wall temperature is estimated based on the engine operating conditions to correspond to the amount of heat, the temperature can be changed by adjusting the valve opening, so pay attention only to the temperature of the control result, and the cooling circuit The degree to which the amount of heat changes due to switching is not considered much.
From the viewpoint of keeping the operating condition in the process of warming up the engine, an adjustment valve that switches the distribution is considered to be effective, but if the circuit becomes complicated, it is difficult to adjust the temperature fluctuation, and a heater is used in combination. In some cases, the temperature setting control in the circuit setting or the circuit change giving priority to the heater is likely to be complicated. In addition, since the regulating valve always exists as a resistance, there is a disadvantage that the efficiency is lowered particularly when high efficiency and cooling are required after complete warm-up.

  The present invention provides an efficient cooling system that optimizes the operating state of an internal combustion engine to improve fuel efficiency, improves the warm-up performance by switching control of the cooling system, and is efficient regardless of the warm-up state of the internal combustion engine. For the purpose.

  Therefore, in order to eliminate the above-mentioned inconvenience, the present invention can form a closed circuit connected to the first path through which the power source of the vehicle including the internal combustion engine can be cooled and connected to the first path, And one or more second paths having a heat capacity portion, and a switching valve that can be switched between communication and blocking of the first and second paths and provided corresponding to the second path, and flows through the path A cooling system that includes a cooling water pump that pumps cooling water and a water temperature detection means that detects the temperature of the cooling water, and that can control the operation of the switching valve based on the state of the internal combustion engine including the detected water temperature In this control device, when the internal combustion engine is determined to have reached the fully warmed-up temperature based on the detected water temperature, or provided after the start, the heat amount integrating means for starting the integration of the heat amount is provided, corresponding to the second path Predetermined amount of heat and integrate Amount of heat, characterized in that the control to change the switching valve that corresponds to the open state when exceeding a predetermined quantity of heat corresponding to the second path.

As described above in detail, according to the present invention, the first path passing through the power source of the vehicle including the internal combustion engine in a coolable manner, the closed path connected to the first path, and the heat capacity portion. One or more second paths having a switching path, switching between the communication between the first path and the second path, and a switching valve provided corresponding to the second path, and cooling water flowing through the path. In a control device for a cooling system, comprising a cooling water pump for pressure-feeding and a water temperature detecting means for detecting a cooling water temperature, and capable of controlling the operation of the switching valve based on the state of the internal combustion engine including the detected water temperature When the internal combustion engine is determined to have reached the fully warmed-up temperature based on the detected water temperature or after starting, the heat amount integrating means for starting the integration of the heat amount is provided, and the predetermined heat amount corresponding to the second path is set in advance. Set and integrated heat quantity to the second path Controlling to change the corresponding switching valve when exceeding a predetermined quantity of heat that respond to the open state.
Therefore, the route (circuit) of the cooling system can be subdivided to reduce the flow of cooling water in the internal combustion engine as a heat source, minimize the initial capacity, and minimize the time required for complete warm-up. .
Further, since a surplus amount of heat is given in advance to the temperature change (drop) after the path switching, it is possible to ensure control stability without crossing over the complete warm temperature.
Furthermore, by limiting the initial capacity, the amount of cooling water at a relatively high temperature decreases, and even when the temperature change (drop) due to the path switching increases, the complete warming temperature is not crossed and the control is stable. Can be secured.

FIG. 1 is a flowchart for control of a control device for a cooling system according to a first embodiment of the present invention. Example 1 FIG. 2 is a time chart of the control device of the cooling system. Example 1 FIG. 3 is a schematic configuration diagram of a control device of the cooling system. Example 1 FIG. 4 is a flowchart for valve opening control at the time of knock detection of the control device of the cooling system showing the second embodiment of the present invention. (Example 2) FIG. 5 is a flow chart for valve opening control when the heater of the cooling system control apparatus according to the third embodiment of the present invention is turned on. (Example 3) FIG. 6 is a flow chart for switching valve opening control when the heater of the cooling system control apparatus according to the fourth embodiment of the present invention is turned on. Example 4

  Embodiments of the present invention will be described below in detail with reference to the drawings.

1 to 3 show a first embodiment of the present invention.
In FIG. 3, 1 is a control device of the cooling system.
As shown in FIG. 3, the control device 1 of the cooling system can form a closed circuit by being connected to the first path 3 through which the power source of the vehicle including the internal combustion engine 2 can be cooled and connected to the first path 3. In addition, the one or more second paths 5 having the heat capacity portion 4 can be switched between communication and blocking between the first path 3 and the second path 5, and correspond to the second path 5. And a switching valve (also referred to as a “shut-off valve V”) 6, a cooling water pump 7 that pumps the cooling water so as to flow through the path, and a water temperature detection means 8 that detects the temperature of the cooling water. The operation of the switching valve 6 can be controlled based on the state of the internal combustion engine 2 including the water temperature.
That is, the first path 3 of the control device 1 of the cooling system is a path for connecting the internal combustion engine 2 and the cooling water pump 7 as shown in FIG.
The heat capacity unit 4 includes one radiator 9 for the internal combustion engine 2, a vehicle interior air conditioner heater (particularly, a heat exchanger thereof) 10, and an internal combustion engine auxiliary device (herein, “throttle body”) 11. As described above, preferably two or more, for example, three of them are provided, and a plurality of the second passages 5 and a plurality of the switching valves 6 are provided corresponding to them.
That is, by including the heat capacity part 4 including three, the second path 5 includes the first second path 5a, the second second path 5b, and the third second path 5c. The switching valve 6 is composed of three first to third switching valves (“shutoff valves V1, V2, V3” provided in the first to third second paths 5a, 5b, 5c, respectively. It is also referred to as “.” 6a, 6b, 6c.
At this time, as shown in FIG. 3, the first second path 5a is a path that connects the intermediate portion of the first path 3 and the internal combustion engine 2, and the first second path 5a A radiator 9 for the internal combustion engine 2, a heat sensitive valve (also referred to as “thermostat”) 12, and a first switching valve 6 a are sequentially arranged on the way from the connection portion with the first path 3 toward the internal combustion engine 2. Set up.
Further, as shown in FIG. 3, the second second path 5b is also a path that connects the intermediate portion of the first path 3 and the internal combustion engine 2. As is apparent from FIG. The first second path 5a is independent of the first second path 5a, and is located in the middle of the second second path 5b from the connecting part with the first path 3 toward the internal combustion engine 2. The auxiliary machine (throttle body) 11 and the second switching valve 6b are sequentially arranged.
Further, as shown in FIG. 3, the third second path 5c is a path that bypasses the middle portion of the first second path 5a described above. As is apparent from FIG. The radiator 9, the heat sensitive valve 12, and the first switching valve 6 a are bypassed, and in the middle part of the third second path 5 c, the vehicle interior air conditioner heater (in particular, from the upstream side toward the downstream side) The heat exchanger) 10 and the third switching valve 6c are sequentially arranged.

Then, based on the detected water temperature, there is provided a heat amount integrating means 13 for starting the integration of the heat amount from the time when it is determined that the internal combustion engine 2 has reached the complete warm-up temperature, and a predetermined amount corresponding to the second path 5 is provided. A heat amount is set in advance, and when the accumulated heat amount exceeds a predetermined heat amount corresponding to the second path 5, the corresponding switching valve 6 is controlled to be changed to a valve open state.
More specifically, complete warming refers to complete warming up of the internal combustion engine 2, and complete warming temperature refers to complete warming up temperature at the coolant temperature of the internal combustion engine 2.
As shown in FIG. 3, the control device 1 of the cooling system includes a control unit 14. For example, the heat amount integration unit 13 is provided in the control unit 14, and the water amount detection unit 8 includes the heat amount integration unit 13. The detection signal of the water temperature detected by the above is input, and the integration of the heat quantity is started after it is determined that the internal combustion engine 2 has reached the complete warm-up temperature based on the detected water temperature.
Further, the control means 14 presets a predetermined amount of heat corresponding to the second path 5, and when the integrated amount of heat exceeds a predetermined amount of heat corresponding to the second path 5, the corresponding switching valve 6 is controlled to be changed to the valve open state.
Therefore, the route (circuit) of the cooling system is subdivided, the flow of cooling water in the internal combustion engine 2 as a heat source is reduced, the initial capacity is minimized, and the time required for complete warm-up is minimized. it can.
Further, since a surplus amount of heat is given in advance to the temperature change (drop) after the path switching, it is possible to ensure control stability without crossing over the complete warm temperature.
In addition, by limiting the initial capacity, even when the amount of cooling water at a relatively high temperature decreases and the temperature change (drop) due to path switching increases, the complete warming temperature is not crossed and control stability is maintained. Can be secured.

In addition, a predetermined amount of heat is set in each of the plurality of second paths 5, a threshold value for the integrated heat amount is set in consideration of the set predetermined heat amount, and one or more when the integrated heat amount reaches the threshold value The switching valve 6 is controlled so as to change the open state.
That is, since the switching valve 6 includes three first to third switching valves 6a, 6b, and 6c, each threshold value for controlling the first to third switching valves 6a, 6b, and 6c is set to V1. The threshold value, the V2 threshold value, and the V3 threshold value are set.
Therefore, switching of a plurality of paths can be optimally controlled based on the heat capacity and priority.
Moreover, since each heat quantity corresponding to a plurality of paths can be managed by one integration, the calculation load of the control device 1 of the cooling system can be reduced.
Furthermore, switching at an approximate temperature, which is difficult with the combination of the heat sensitive valves 12, is also possible.

In the control device 1 of the cooling system, the heat amount is accumulated by estimated integration based on one or more variables of water temperature, oil temperature, intake air intake amount, and fuel injection amount, while the valve is opened based on the accumulated heat amount. When the temperature of the water detected in (2) becomes equal to or lower than the complete warm-up temperature, the switching valve 6 that has been quickly opened is closed. The valve is simply fully closed or the flow rate is reduced by adjusting the opening. When the opening degree is adjusted, duty control for controlling the distribution of the opening time and the closing time may be used.
In addition, when performing the estimation integration, it is desirable to perform calculation by adding various corrections related to traveling to the above-described variables to estimate an accurate amount of heat.
Therefore, by applying the function of the control device 1 of the cooling system, it is possible to perform calculation without increasing the calculation load and cost, and to manage when the water temperature maintenance does not work well due to accumulation of estimation errors. Thus, the combustion state of the internal combustion engine 2 can be set to a desired state.

The control device 1 of the cooling system immediately opens the switching valve 6 when the detected water temperature is equal to or higher than a predetermined upper limit water temperature during the control in which the switching valve 6 is closed. To do.
Therefore, the internal combustion engine 2 can be protected.
Moreover, it is an exception that is performed at the time of restart or the like, and the merchantability of the vehicle can be ensured.

The cooling water pump 7 is provided so as to be able to be driven and stopped independently of the driving state of the internal combustion engine 2, and the internal combustion engine 2 has reached a fully warmed-up temperature based on the detected water temperature. Control is performed so that the cooling water pump 7 is stopped during warm-up until the determination, and the cooling water pump 7 is driven after the determination.
Therefore, the route (circuit) of the cooling system is subdivided, the flow of cooling water in the internal combustion engine 2 as a heat source is reduced, the initial capacity is minimized, and the time required for complete warm-up is minimized. it can.
In addition, by limiting the initial capacity, even when a temperature change (drop) due to path switching becomes relatively large, it is possible to ensure control stability without crossing over the complete warming temperature.

A radiator 9 for the internal combustion engine 2 is provided as the heat capacity unit 4, and the second path 5, the switching valve 6, and the heat sensitive valve 12 corresponding thereto are provided, and the internal combustion engine 2 is brought to a completely warm-up temperature based on the detected water temperature. When it is determined that the heat amount has reached and the accumulated amount of heat exceeds a predetermined amount of heat corresponding to the second path 5, the switching valve 6 is changed to an open state. Control to perform switching.
Therefore, the cooling system path (circuit) is subdivided, the flow of cooling water in the internal combustion engine 2 as a heat source is reduced, the initial capacity is minimized, the time required for complete warm-up is minimized, and After the warming-up, the path switching is performed by the automatic operation of the thermal valve 12, and the switching control of the control device 1 of the cooling system can be simplified.

In addition, in FIG. 2, the V1 threshold value, the V2 threshold value, and the V3 threshold value are determined in the same order with respect to the integration of the amount of heat. An example of setting to open in this way by the operation according to the flowchart is shown.
What is important in FIG. 2 is that the water temperature has not dropped below the full warm-up temperature once, and the amount of heat Q1 corresponding to 0 (zero) to the V1 threshold, from the V1 threshold to the V2 threshold. The heat quantity Q2 corresponding to the heat quantity Q3 corresponding to the V2 threshold value to the V3 threshold value is taken into consideration.

Here, attention is paid to the heat amount integration and the water temperature (the present invention) in FIG.
The three first to third switching valves 6a, 6b, 6c are all closed until the water temperature reaches the complete warm-up temperature after the start, and the most compact circuit ("non-circulation system" or "minimum circulation system") In other words, the rate of increase in water temperature is higher than that of the conventional system. At this time, heat integration has not been performed yet.
After the water temperature reaches the complete warm-up temperature, while the heat quantity Q1 is integrated, the water temperature rises to a certain temperature (for convenience, described as “V1 switching water temperature”), and the first switching is performed. When the valve 6a is switched from the closed state to the open state (V1 flag), the circuit of the cooling system changes depending on the path that has been communicated due to this switching ("the first state of the circulation system"). It can be seen that the temperature of the cooling water is temporarily lowered due to the mixing of the low temperature cooling water in the communication path. Here, the lowered water temperature does not fall to the complete warm-up temperature (or to a lower temperature), and starts to rise again due to the amount of heat continuously obtained. Since the water temperature does not change across the complete warm-up temperature, control hunting does not occur.
The amount of heat is integrated based on the amount of heat input, and this amount of input heat is calculated mainly based on the combustion state of the internal combustion engine 2, and here, warm-up propulsion control (ignition timing retard control and rotation speed increase correction control) The amount of heat in the normal control state (control including general correction control) is integrated instead of the state in which a large amount of heat is generated due to combustion).
The warm-up temperature reaches the complete warm-up temperature in a short time compared to the conventional case, and thereafter it can be maintained so as not to fall below the complete warm-up temperature. Therefore, the operating state of the internal combustion engine 2 is shifted from the warm-up promotion control to the normal control quickly. It is possible to perform stable control to continue the operation.
As described above, after the first switching valve 6a is switched from the previous closed state to the opened state, the circuit of the cooling system is changed by the path that is communicated by this switching (the first circulation system first). After the change to the state), while the heat amount integrated value reaches the V2 threshold value from the V1 threshold value, that is, while the heat amount Q2 is integrated after reaching the heat amount Q1, it is described as a certain temperature (for convenience, “V2 switching water temperature”) ). When the second switching valve 6b is switched from the closed state to the open state (V2 flag), the circuit of the cooling system changes depending on the path that has been communicated due to this switching ("circulation system second" The temperature of the cooling water is temporarily lowered by mixing the low-temperature cooling water in the communication path. Here again, the lowered water temperature does not fall to the full warm-up temperature (or to a lower temperature), and starts to rise again due to the amount of heat continuously obtained.
When the first switching valve 6a is switched from the closed state to the open state, the heat amount integrated value only needs to be ensured by the heat amount Q1, and when the second switching valve 6b is switched from the closed state to the open state, the heat amount integrated value is the heat amount. Since only Q2 needs to be secured, it is possible to set the first switching valve 6a and the second switching valve 6b to be opened at the same time as the V2 threshold in FIG. In that case, the V1 threshold and the V2 threshold are the same. Further, the opening order of the first switching valve 6a and the second switching valve 6b is reversed, and the second switching valve 6b is placed before the first switching valve 6a when the heat amount integrated value is ensured by the heat amount Q2. It is also possible to switch from the closed state to the open state and then set the first switching valve 6a to be switched from the closed state to the open state when the heat amount integrated value is ensured by the heat amount Q1.

Although not shown, the cooling water pump 7 is basically driven by a belt driven by a crankshaft (not shown) of the internal combustion engine 2.
A drive type using an electric motor may be used, or a clutch capable of switching between driving / stopping may be provided.
In the latter two types, the time required until the initial complete warm-up can be further shortened by stopping the cooling water pump.

  Next, the operation will be described along the control flowchart of the control device 1 of the cooling system of FIG.

When the control program of the control device 1 of the cooling system is started (101), the start trigger (STSW ON, etc.) includes a cooling water shutoff valve, that is, three first to third switching valves 6a, 6b, 6c. The process proceeds to a process (102) for closing the switching valve 6.
After this process (102), in order to perform [complete warming determination], the process proceeds to determination (103) of whether or not the water temperature is equal to or higher than the complete warm-up temperature, that is, whether the water temperature is equal to or greater than the complete warm-up temperature.
In this determination (103), if the determination (103) is NO, the determination (103) is repeated until the determination (103) becomes YES. If the determination (103) is YES, the heat amount integration start is performed. The process proceeds to processing (104).
After this heat amount integration start processing (104), [valve opening determination] is performed, so that the current heat amount integration is equal to or higher than the V1 threshold, that is, the current heat amount integration ≧ V1 threshold, or the water temperature is equal to or higher than the upper limit water temperature, that is, water temperature ≧ The process proceeds to determination (105) of whether or not the upper limit water temperature is reached.
In this determination (105), if the determination (105) is NO, the determination (105) is repeated until the determination (105) is YES, and if the determination (105) is YES, the shut-off valve The process proceeds to a process (106) for opening the first switching valve 6a which is V1.
Then, after the processing (106) for opening the first switching valve 6a, which is the shutoff valve V1, the post-opening water temperature determination is performed. The process proceeds to judgment (107) of whether the temperature is equal to or higher than the machine temperature, that is, whether the water temperature is equal to or higher than the complete warm-up temperature.
Further, in this determination (107), if the determination (107) is NO, the process proceeds to the processing (108) for closing the first switching valve 6a, which is the shutoff valve V1, and then the above-mentioned [completed]. In order to perform the “warm determination”, the process returns to the determination (103) as to whether or not the water temperature is equal to or higher than the complete warm-up temperature, that is, the water temperature ≧ the complete warm-up temperature.

If the determination (107) is YES, the valve opening determination is performed, so that the current heat integration is equal to or higher than the V2 threshold, that is, the current heat integration ≧ V2 threshold, or the water temperature is equal to or higher than the upper limit water temperature, that is, the water temperature. It shifts to judgment (109) whether it is> = upper limit water temperature.
In this determination (109), if the determination (109) is NO, the determination (109) is repeated until the determination (109) becomes YES. If the determination (109) is YES, the shut-off valve The process proceeds to a process (110) for opening the second switching valve 6b which is V2.
Further, after the processing (110) for opening the second switching valve 6b, which is the shutoff valve V2, the water temperature determination after valve opening is performed, so that the water temperature after a certain time has elapsed after the valve is opened is completely warmed up. The process proceeds to the determination (111) of whether the temperature is equal to or higher than the temperature, that is, the water temperature is equal to or greater than the complete warm-up temperature.
In this determination (111), when the determination (111) is NO, the process proceeds to the processing (112) for closing the second switching valve 6b, which is the shutoff valve V2, and then the above-mentioned [complete warming determination] ], The process returns to the determination (103) of whether or not the water temperature is equal to or higher than the complete warm-up temperature, that is, the water temperature ≧ the complete warm-up temperature.

Further, when the determination (111) is YES, the valve opening determination is performed, so that the current heat integration is equal to or higher than the V3 threshold, that is, the current heat integration ≧ V3 threshold, or the water temperature is equal to or higher than the upper limit water temperature, that is, the water temperature. It shifts to judgment (113) whether it is> = upper limit water temperature.
In this determination (113), if the determination (113) is NO, the determination (113) is repeated until the determination (113) becomes YES, and if the determination (113) is YES, the shut-off valve The process proceeds to a process (114) of opening the third switching valve 6c which is V3.
Further, after the process (114) for opening the third switching valve 6c, which is the shutoff valve V3, to perform [water temperature determination after valve opening], the water temperature after a certain period of time has elapsed since the valve opened. The process proceeds to the determination (115) as to whether the temperature is equal to or higher than the temperature, that is, the water temperature ≧ the complete warm-up temperature.
In this determination (115), when the determination (115) is NO, the process proceeds to the processing (116) for closing the third switching valve 6c, which is the shutoff valve V3, and then the above-mentioned [complete warming determination] ], The process returns to the determination (103) of whether or not the water temperature is equal to or higher than the complete warm-up temperature, that is, the water temperature ≧ the complete warm-up temperature.
If the determination (115) is YES, the process proceeds to the end (117) of the control program of the control device 1 of the cooling system.

FIG. 4 shows a second embodiment of the present invention.
In the second embodiment, portions that perform the same functions as those of the first embodiment will be described with the same reference numerals.
The feature of the second embodiment is that if abnormal combustion of the internal combustion engine (also referred to as “knocking”) is detected during the control in which the state of the switching valve is closed, it is promptly performed. The point is that the switching valve is opened.
That is, during the control in which the state of the switching valve composed of the three first to third switching valves is closed, it is detected whether abnormal combustion has occurred in the internal combustion engine, and abnormal combustion of the internal combustion engine is detected. When is detected, the switching valve composed of the three first to third switching valves is controlled to be quickly opened.
At this time, in order to detect abnormal combustion of the internal combustion engine, that is, [knock detection]
(1) Abnormal combustion of the internal combustion engine when the number of knocks (total number of times from the start to the present) is greater than or equal to the threshold, that is, the number of knocks ≧ threshold (2) If the knock frequency is greater than or equal to the threshold, that is, knock frequency ≧ threshold Is detected, and the switching valve including the three first to third switching valves is immediately opened.
And when abnormal combustion of an internal combustion engine is detected, the switching valve which consists of three 1st-3rd switching valves is immediately opened, and it is made to feed back to the water temperature which does not detect a knock.
Therefore, the internal combustion engine can be protected.
Moreover, it is an exception that is performed at the time of restart or the like, and the merchantability of the vehicle can be ensured.

  Next, the operation will be described along the control flowchart of the control device of the cooling system of FIG.

When the control program of the control device of the cooling system starts (201),
The process proceeds to a process (202) for closing the cooling water shutoff valve, that is, the switching valve composed of the three first to third switching valves, by the start trigger (STSW ON or the like).
After this process (202),
In order to perform [knock detection]
(1) The number of knocks (total number of times from the start to the present) is equal to or greater than a threshold value, that is, the number of knocks ≧ the threshold value (2) The determination of whether or not the knock frequency is equal to or greater than the threshold value, that is, the knock frequency ≧ the threshold value (203) ).
In this determination (203), if the determination (203) is NO, the determination (203) is repeated until the determination (203) is YES, and if the determination (203) is YES, the shut-off valve The process proceeds to processing (204) for sequentially opening the first to third switching valves V1, V2, and V3.
In this process (204), it is possible to make all the first to third switching valves open simultaneously by one determination.
In addition, after the process (204) of sequentially opening the first to third switching valves that are the shutoff valves V1, V2, and V3, the process proceeds to the determination (205) of whether or not the cooling water flow path shutoff control is finished. To do.
In this determination (205), if the determination (205) is NO, the above-described [knock detection] is performed.
(1) The number of knocks (total number of times from the start to the present) is equal to or greater than a threshold value, that is, the number of knocks ≧ the threshold value (2) The determination of whether or not the knock frequency is equal to or greater than the threshold value, that is, the knock frequency ≧ the threshold value (203) Return to).
Further, when the determination (205) is YES, it is determined that the engine is completely warmed up, and the process proceeds to the end (206) of the control program of the control device of the cooling system in order to stop this control.

FIG. 5 shows a third embodiment of the present invention.
The feature of the third embodiment is that when there is a request for driving a heater for the vehicle interior air conditioning during the control in which the state of the switching valve is closed, the corresponding switching valve is quickly opened. It is in the point made into the composition to be.
That is, during the control in which the state of the switching valve composed of the first to third switching valves is closed, it is detected whether there is a drive request for the heater for the vehicle interior air conditioning, When the heater driving request is detected, the heater valve shut-off valve among the switching valves composed of the three first to third switching valves, that is, in the first embodiment described above, the third Control is performed so that the third switching valve 6c, which is the shutoff valve V3 of the two-path 5c, is quickly opened.
At this time, as a measure for determining whether or not there is a request for driving the heater for air conditioning in the vehicle interior, it is determined whether or not the heater is turned on.
Therefore, passenger comfort can be ensured.
Moreover, it is an exception that is performed at the time of start-up in a cold region, and the merchantability of the vehicle can be ensured.

  Next, the operation will be described along the control flowchart of the control device of the cooling system of FIG.

When the control program of the control device of the cooling system starts (301), the cooling water shut-off valve, that is, the switching valve composed of three first to third switching valves is closed by a start trigger (STSW ON, etc.). The process proceeds to (302).
After this processing (302), the routine proceeds to judgment (303) as to whether or not the vehicle interior air conditioning heater is turned on.
In this determination (303), if the determination (303) is NO, the determination (303) is repeated until the determination (303) becomes YES. If the determination (303) is YES, the heater flow The process proceeds to a process (304) of opening the third switching valve 6c, which is the shutoff valve V3 of the third second path 5c corresponding to the first embodiment described above, in the first embodiment.
In addition, after the process (304) for opening the shut-off valve of the heater flow path, that is, the third switching valve 6c, which is the shut-off valve V3 of the third second path 5c corresponding in the first embodiment described above, is opened. Then, the process proceeds to the determination (305) of whether or not the cooling water flow path cutoff control is finished.
If the determination (305) is NO in this determination (305), the process returns to the determination (303) as to whether or not the above-described vehicle interior air conditioning heater is turned on.
Further, when the determination (305) is YES, it is determined that the engine is completely warmed up, and therefore, the process proceeds to the end (306) of the control program of the control device of the cooling system in order to stop this control.

FIG. 6 shows a fourth embodiment of the present invention.
The feature of this fourth embodiment is that if there is a drive request for the air conditioning heater during the control in which the switching valve is closed, it responds promptly according to the set temperature of the heater. The switching valve is opened while adjusting the opening of the switching valve.
That is, during the control in which the state of the switching valve composed of the first to third switching valves is closed, it is detected whether there is a drive request for the heater for the vehicle interior air conditioning, When a heater driving request is detected, the heater flow path shut-off valve among the three switching valves including the first to third switching valves, that is, the above-described first valve, depending on the water temperature, the set temperature, the rotation speed, and the like. In the embodiment, the third switching valve 6c, which is the shutoff valve V3 of the third second path 5c, is controlled to be quickly opened while adjusting the opening.
At this time, as a measure for determining whether or not there is a request for driving the heater for air conditioning in the vehicle interior, it is determined whether or not the heater is turned on.
Therefore, passenger comfort can be ensured.
Moreover, it is an exception that is performed at the time of start-up in a cold region, and the merchantability of the vehicle can be ensured.

  Next, the operation will be described along the control flowchart of the control device of the cooling system of FIG.

When the control program of the control device of the cooling system is started (401), the cooling water shutoff valve, that is, the switching valve composed of three first to third switching valves is closed by a start trigger (STSW ON, etc.). The process proceeds to (402).
After this process (402), the routine proceeds to judgment (403) on whether or not the vehicle interior air conditioning heater is turned on.
In this determination (403), if the determination (403) is NO, the determination (403) is repeated until the determination (403) is YES, and if the determination (403) is YES, the set temperature * Transfer to the reading process (404) of ° C. In this process (404), a preset temperature set in advance is read into the control means and used for calculation described later.
After this process (404), the heater passage shut-off valve among the switching valves composed of three first to third switching valves according to the water temperature, the set temperature, the rotation speed, etc., that is, in the first embodiment described above. Calculates the opening degree of the third switching valve 6c which is the cutoff valve V3 of the third second path 5c, and opens the valve quickly while adjusting the opening degree of the third switching valve 6c which is the cutoff valve V3. The process proceeds to a process (405) for controlling to be in a state.
Further, of the switching valves composed of the three first to third switching valves, depending on the water temperature, the set temperature, the rotational speed, etc., the shut-off valve for the heater flow path, that is, the third corresponding to the first embodiment described above. The opening degree of the third switching valve 6c, which is the shutoff valve V3 of the two-path 5c, is calculated, and control is performed so as to quickly open the valve while adjusting the opening degree of the third switching valve 6c, which is the shutoff valve V3. After the process (405), the process proceeds to a determination (406) as to whether or not the cooling water flow path blocking control has been completed.
If the determination (406) is NO in this determination (406), the process returns to the determination (403) as to whether or not the above-described vehicle interior air conditioning heater is turned on.
Further, when the determination (406) is YES, it is determined that the engine is completely warmed up, so that the control program end (407) of the control device of the cooling system is shifted to stop this control.

  The present invention is not limited to the above-described embodiments, and various application modifications are possible.

  For example, when the temperature of the water is increased from the start to the complete warm-up or above the complete warm-up by other warming-up promotion means such as stopping the cooling water pump, and then the cooling water pump is operated, a sudden temperature drop occurs. Therefore, it is possible to block the flow path having a large heat capacity by combining the cooling water flow path shut-off valve, that is, the third switching valve which is the shut-off valve V3 of the third second path corresponding in the first embodiment described above. It is also possible to have a special configuration that suppresses a rapid drop in water temperature after the cooling water pump is activated.

Further, in the first embodiment, the integration of the heat amount is started after the time when it is determined that the internal combustion engine has reached the complete warm-up temperature based on the detected water temperature. It may be a start. The former is preferable because the calculation time is short, the error is small, and the memory area required is small. However, the latter can be realized.
Further, by combining a cooling water flow path shut-off valve in series with a conventional temperature sensing valve (thermostat), that is, a third switching valve that is the shut-off valve V3 of the third second path corresponding in the first embodiment described above. When the engine is cold, the third switching valve, which is the shutoff valve V3, is closed and the water temperature is raised from the start to a fully warmed-up water temperature. After reaching a sufficient oil temperature, the third switching valve, which is the shutoff valve V3, is opened. In addition, it is possible to adopt a special configuration in which the water temperature is controlled at a conventional complete warm-up water temperature by a conventional thermostat.
Moreover, although the flow direction of the cooling water is indicated by an arrow in FIG. 3, it can be implemented in the reverse direction. That is, the arrangement order of the components of the switching valve and the heat capacity unit may be switched between upstream and downstream.

DESCRIPTION OF SYMBOLS 1 Control apparatus of cooling system 2 Internal combustion engine 3 1st path | route 4 Heat capacity part 5 2nd path | route 5a 1st 2nd path | route 5b 2nd 2nd path | route 5c 3rd 2nd path | route 6 Also referred to as "V".)
6a, 6b, 6c First to third switching valves (also referred to as “shutoff valves V1, V2, V3”)
7 Cooling water pump 8 Water temperature detection means 9 Radiator for internal combustion engine 10 Heater for air conditioning in vehicle compartment 11 Auxiliary machine for internal combustion engine (referred to as “throttle body”)
12 thermal valve 13 heat quantity integrating means 14 control means

Claims (8)

  A first path that coolably passes through a power source of a vehicle including the internal combustion engine, and one or more second paths that are connected to the first path and that can form a closed circuit and have a heat capacity portion; A switching valve that can be switched between communication and blocking between the first and second paths and that is provided corresponding to the second path, a cooling water pump that pumps cooling water to flow through the path, and cooling water An internal combustion engine based on the detected water temperature in the control device of the cooling system, wherein the operation of the switching valve is controllable based on the state of the internal combustion engine including the detected water temperature. Is provided with a heat amount integration means for starting the integration of the amount of heat from the time of starting or after starting, and a predetermined amount of heat corresponding to the second path is set in advance, and the integrated amount of heat is Exceeds the predetermined amount of heat corresponding to the second path Controller of the cooling system, characterized by controlling so as to change the switching valve in the open state thereof corresponding to the case that.   The heat capacity section includes one or more of a radiator for an internal combustion engine, a heat exchanger for a heater for vehicle interior air conditioning, and an auxiliary machine for the internal combustion engine, and the second path and the switching valve corresponding to them are respectively provided. A plurality of the plurality of second paths are set with a predetermined amount of heat, a threshold value for the integrated heat amount is set in consideration of the set predetermined heat amount, and one or more when the integrated heat amount reaches the threshold value The control device for a cooling system according to claim 1, wherein control is performed so as to change a valve opening state of the switching valve.   Accumulation of heat is performed by estimated integration based on one or more variables of water temperature, oil temperature, intake air intake amount, and fuel injection amount, while the water temperature detected after opening the valve based on the integrated heat amount is completely warmed up. The control device for a cooling system according to claim 1 or 2, wherein when the temperature becomes lower than the temperature, the switching valve that is opened quickly is closed or the opening degree is adjusted.   A heat exchanger for a vehicle interior air conditioning heater is provided as the heat capacity section, and the second path and the switching valve corresponding to the heat exchanger are provided. During the control in which the switching valve is closed, The control device for a cooling system according to any one of claims 1 to 3, wherein when there is a drive request, the corresponding switching valve is quickly opened.   5. The switch valve is quickly opened when the detected water temperature is equal to or higher than a predetermined upper limit water temperature during the control in which the state of the switch valve is closed. The control device of the cooling system according to 1.   5. The switch valve is quickly opened when abnormal combustion (knocking) of the internal combustion engine is detected during the control in which the switch valve is closed. The control device of the cooling system according to 1.   The cooling water pump is provided so as to be able to be driven and stopped independently of the driving state of the internal combustion engine, and until it is determined that the internal combustion engine has reached a fully warmed-up temperature based on the detected water temperature The cooling system control device according to claim 1, wherein the control of the cooling water pump is stopped during the warming-up, and the cooling water pump is driven after the determination.   After the internal combustion engine radiator is provided as the heat capacity section, the corresponding second path, the switching valve and the heat sensitive valve are provided, and it is determined that the internal combustion engine has reached the fully warmed-up temperature based on the detected water temperature When the accumulated heat amount exceeds a predetermined heat amount corresponding to the second path, the switching valve is changed to an open state, and thereafter, the path is switched by the operation of the thermal valve. The control device for the cooling system according to claim 1.

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